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| Mirrors > Home > MPE Home > Th. List > dm0rn0 | Structured version Visualization version GIF version | ||
| Description: An empty domain is equivalent to an empty range. (Contributed by NM, 21-May-1998.) Avoid ax-10 2182, ax-11 2198, ax-12 2219. (Revised by TM, 24-Jan-2026.) |
| Ref | Expression |
|---|---|
| dm0rn0 | ⊢ (dom 𝐴 = ∅ ↔ ran 𝐴 = ∅) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | breq1 5113 | . . . . . . . 8 ⊢ (𝑧 = 𝑥 → (𝑧𝐴𝑦 ↔ 𝑥𝐴𝑦)) | |
| 2 | breq2 5114 | . . . . . . . 8 ⊢ (𝑦 = 𝑤 → (𝑧𝐴𝑦 ↔ 𝑧𝐴𝑤)) | |
| 3 | 1, 2 | excomw 2073 | . . . . . . 7 ⊢ (∃𝑧∃𝑦 𝑧𝐴𝑦 ↔ ∃𝑦∃𝑧 𝑧𝐴𝑦) |
| 4 | breq2 5114 | . . . . . . . . 9 ⊢ (𝑦 = 𝑤 → (𝑥𝐴𝑦 ↔ 𝑥𝐴𝑤)) | |
| 5 | 1, 4 | sylan9bbr 519 | . . . . . . . 8 ⊢ ((𝑦 = 𝑤 ∧ 𝑧 = 𝑥) → (𝑧𝐴𝑦 ↔ 𝑥𝐴𝑤)) |
| 6 | 5 | cbvex2vw 2068 | . . . . . . 7 ⊢ (∃𝑦∃𝑧 𝑧𝐴𝑦 ↔ ∃𝑤∃𝑥 𝑥𝐴𝑤) |
| 7 | 3, 6 | bitri 278 | . . . . . 6 ⊢ (∃𝑧∃𝑦 𝑧𝐴𝑦 ↔ ∃𝑤∃𝑥 𝑥𝐴𝑤) |
| 8 | 7 | notbii 323 | . . . . 5 ⊢ (¬ ∃𝑧∃𝑦 𝑧𝐴𝑦 ↔ ¬ ∃𝑤∃𝑥 𝑥𝐴𝑤) |
| 9 | alnex 1808 | . . . . 5 ⊢ (∀𝑧 ¬ ∃𝑦 𝑧𝐴𝑦 ↔ ¬ ∃𝑧∃𝑦 𝑧𝐴𝑦) | |
| 10 | alnex 1808 | . . . . 5 ⊢ (∀𝑤 ¬ ∃𝑥 𝑥𝐴𝑤 ↔ ¬ ∃𝑤∃𝑥 𝑥𝐴𝑤) | |
| 11 | 8, 9, 10 | 3bitr4i 306 | . . . 4 ⊢ (∀𝑧 ¬ ∃𝑦 𝑧𝐴𝑦 ↔ ∀𝑤 ¬ ∃𝑥 𝑥𝐴𝑤) |
| 12 | noel 4299 | . . . . . 6 ⊢ ¬ 𝑧 ∈ ∅ | |
| 13 | 12 | nbn 375 | . . . . 5 ⊢ (¬ ∃𝑦 𝑧𝐴𝑦 ↔ (∃𝑦 𝑧𝐴𝑦 ↔ 𝑧 ∈ ∅)) |
| 14 | 13 | albii 1846 | . . . 4 ⊢ (∀𝑧 ¬ ∃𝑦 𝑧𝐴𝑦 ↔ ∀𝑧(∃𝑦 𝑧𝐴𝑦 ↔ 𝑧 ∈ ∅)) |
| 15 | noel 4299 | . . . . . 6 ⊢ ¬ 𝑤 ∈ ∅ | |
| 16 | 15 | nbn 375 | . . . . 5 ⊢ (¬ ∃𝑥 𝑥𝐴𝑤 ↔ (∃𝑥 𝑥𝐴𝑤 ↔ 𝑤 ∈ ∅)) |
| 17 | 16 | albii 1846 | . . . 4 ⊢ (∀𝑤 ¬ ∃𝑥 𝑥𝐴𝑤 ↔ ∀𝑤(∃𝑥 𝑥𝐴𝑤 ↔ 𝑤 ∈ ∅)) |
| 18 | 11, 14, 17 | 3bitr3i 304 | . . 3 ⊢ (∀𝑧(∃𝑦 𝑧𝐴𝑦 ↔ 𝑧 ∈ ∅) ↔ ∀𝑤(∃𝑥 𝑥𝐴𝑤 ↔ 𝑤 ∈ ∅)) |
| 19 | breq1 5113 | . . . . 5 ⊢ (𝑥 = 𝑧 → (𝑥𝐴𝑦 ↔ 𝑧𝐴𝑦)) | |
| 20 | 19 | exbidv 1948 | . . . 4 ⊢ (𝑥 = 𝑧 → (∃𝑦 𝑥𝐴𝑦 ↔ ∃𝑦 𝑧𝐴𝑦)) |
| 21 | 20 | eqabcbw 2843 | . . 3 ⊢ ({𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} = ∅ ↔ ∀𝑧(∃𝑦 𝑧𝐴𝑦 ↔ 𝑧 ∈ ∅)) |
| 22 | 4 | exbidv 1948 | . . . 4 ⊢ (𝑦 = 𝑤 → (∃𝑥 𝑥𝐴𝑦 ↔ ∃𝑥 𝑥𝐴𝑤)) |
| 23 | 22 | eqabcbw 2843 | . . 3 ⊢ ({𝑦 ∣ ∃𝑥 𝑥𝐴𝑦} = ∅ ↔ ∀𝑤(∃𝑥 𝑥𝐴𝑤 ↔ 𝑤 ∈ ∅)) |
| 24 | 18, 21, 23 | 3bitr4i 306 | . 2 ⊢ ({𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} = ∅ ↔ {𝑦 ∣ ∃𝑥 𝑥𝐴𝑦} = ∅) |
| 25 | df-dm 5669 | . . 3 ⊢ dom 𝐴 = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} | |
| 26 | 25 | eqeq1i 2774 | . 2 ⊢ (dom 𝐴 = ∅ ↔ {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} = ∅) |
| 27 | dfrn2 5876 | . . 3 ⊢ ran 𝐴 = {𝑦 ∣ ∃𝑥 𝑥𝐴𝑦} | |
| 28 | 27 | eqeq1i 2774 | . 2 ⊢ (ran 𝐴 = ∅ ↔ {𝑦 ∣ ∃𝑥 𝑥𝐴𝑦} = ∅) |
| 29 | 24, 26, 28 | 3bitr4i 306 | 1 ⊢ (dom 𝐴 = ∅ ↔ ran 𝐴 = ∅) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ↔ wb 209 ∀wal 1565 = wceq 1567 ∃wex 1806 ∈ wcel 2149 {cab 2747 ∅c0 4294 class class class wbr 5110 dom cdm 5659 ran crn 5660 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 ax-sep 5258 ax-pr 5402 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-clel 2844 df-rab 3424 df-v 3465 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 df-br 5111 df-opab 5175 df-cnv 5667 df-dm 5669 df-rn 5670 |
| This theorem is referenced by: rn0 5914 relrn0 5961 imadisj 6080 rnsnn0 6206 rnmpt0f 6241 f00 6758 f0rn0 6761 2nd0 7989 iinon 8323 onoviun 8326 onnseq 8327 map0b 8877 fodomfib 9284 intrnfi 9372 wdomtr 9533 noinfep 9625 wemapwe 9662 fin23lem31 10323 fin23lem40 10331 isf34lem7 10359 isf34lem6 10360 ttukeylem6 10494 fodomb 10506 rpnnen1lem4 13000 rpnnen1lem5 13001 fseqsupcl 14009 fseqsupubi 14010 dmtrclfv 15051 ruclem11 16292 prmreclem6 16977 0ram 17076 0ram2 17077 0ramcl 17079 gsumval2 18740 ghmrn 19295 gexex 19919 gsumval3 19973 subdrgint 20880 iinopn 23024 hauscmplem 23528 fbasrn 24006 alexsublem 24166 evth 25083 minveclem1 25548 minveclem3b 25552 ovollb2 25613 ovolunlem1a 25620 ovolunlem1 25621 ovoliunlem1 25626 ovoliun2 25630 ioombl1lem4 25685 uniioombllem1 25705 uniioombllem2 25707 uniioombllem6 25712 mbfsup 25788 mbfinf 25789 mbflimsup 25790 itg1climres 25838 itg2monolem1 25874 itg2mono 25877 itg2i1fseq2 25880 itg2cnlem1 25885 minvecolem1 31163 rge0scvg 34280 esumpcvgval 34409 cvmsss2 35661 fin2so 38141 ptrecube 38154 heicant 38189 isbnd3 38318 totbndbnd 38323 rnnonrel 44202 stoweidlem35 46634 hoicvr 47147 |
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